JP2018192565A - Tool holder - Google Patents

Abstract

To provide a tool holder which can absorb stress applied on a tool with a simple structure.SOLUTION: An elastic part 230 passes through between a main body part inner peripheral surface 240 and a main body part outer peripheral surface 250 of a main body part 200, includes a plurality of first air gaps extending along a circumferential direction and a plurality of second air gaps extending along an axial direction, and is structured so as to elastically deform in the axial direction and the circumferential direction. A collar 410 is structured so as to move along the axial direction by interlocking with elastic deformation of the elastic part 230 along the axial direction. An O-ring 461 is arranged between a rear end part of the collar 410 and the main body part outer peripheral surface 250. A support member 420 is structured so as to move along the axial direction by interlocking with movement of a rear end part of the tool 10 along the axial direction. An O-ring 462 is arranged between a rear end part of the support member 420 and the main body part inner peripheral surface 240.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tool holder that holds a tool, and more particularly, to a tool holder that can suitably hold a tap that performs tapping.

When performing tap processing for forming a female screw hole in a workpiece (member to be processed), the tap is gripped by a tool gripping portion of a tool holder (referred to as a “tap holder”) mounted on the spindle of the machine tool. Here, when tapping is performed using a tap, excessive stress may be applied to the blade edge of the tap due to cutting resistance or the like. If excessive stress is applied to the blade edge of the tap, the machining accuracy of the female screw hole may be reduced.
Therefore, a tool holder having a stress absorption mechanism that absorbs stress applied to the blade edge of the tap has been proposed. The tool holder which has a stress absorption mechanism is disclosed by patent document 1 and patent document 2, for example. The tool holder disclosed in Patent Document 1 absorbs a first stress absorbing mechanism that absorbs stress on one side in the axial direction applied to the tool gripping portion and a stress on the other side in the axial direction applied to the tool gripping portion. A second stress absorbing mechanism is included. Further, the tool holder disclosed in Patent Document 2 has one stress absorbing mechanism, and stress applied to the tool gripping portion on one side in the axial direction and stress on the other side in the axial direction are absorbed by the stress absorbing mechanism. It is comprised so that.

JP 2012-11474 A JP 2002-46020 A

In the tool holder disclosed in Patent Document 1, a first stress absorbing mechanism that absorbs stress on one side in the axial direction applied to the tool gripping portion and a second stress absorbing mechanism that absorbs stress on the other side in the axial direction. have. In addition, the tool holder disclosed in Patent Document 2 has one stress absorbing mechanism, and stress applied to the tool gripping portion on one side in the axial direction and stress on the other side in the axial direction are absorbed by the stress absorbing mechanism. It is comprised so that. For this reason, the configuration is complicated.
The present invention has been made in view of such a point, and an object thereof is to provide a tool holder capable of absorbing stress applied to a tool with a simple configuration.

The tool holder of this invention is equipped with the main-body part which has a main-body part inner peripheral surface and a main-body part outer peripheral surface. The main body has a shank portion on the rear end side and a tool gripping portion on the front end side. The shank portion is gripped by a gripping mechanism provided on the spindle of the machine tool. Typically, the outer peripheral surface portion of the main body corresponding to the shank portion of the outer peripheral surface of the main body is gripped by the gripping mechanism of the machine tool. The tool gripping part grips the tool. Typically, the outer peripheral surface of the tool shank portion of the tool inserted into the inner space portion (tool insertion space) of the main body portion formed by the inner peripheral surface portion of the main body portion corresponding to the tool gripping portion of the inner peripheral surface of the main body portion. Is gripped by the inner peripheral surface portion of the main body.
And the main-body part has a 1st elastic part between the shank part and the tool holding part. The first elastic portion is formed between the inner peripheral surface of the main body (the inner peripheral surface portion of the main body corresponding to the first elastic portion) and the outer peripheral surface of the main body (the outer peripheral surface portion of the main body corresponding to the first elastic portion). It has a plurality of first gaps and a plurality of second gaps that penetrate therethrough, and is configured to be elastically deformable along the axial direction and the circumferential direction. The phrase “can be elastically deformed in the axial direction and the circumferential direction” means that the axial direction and the circumferential direction are absorbed so as to absorb the axial direction stress and the circumferential direction stress applied to the tool gripping part when machining with a tool. The structure which can be elastically deformed in the direction is shown.
The first gap extends along the circumferential direction (including “almost along the circumferential direction”) so that at least a part of the first gap overlaps with at least one other first gap in the circumferential direction. Exist. In addition, the second gap extends along the axial direction (including “substantially along the axial direction”) so that at least a part of the second gap overlaps at least one other second gap in the axial direction. doing.
The number, shape (width, cross section, length), arrangement position, and the like of the first gap and the second gap are various within a range in which the first elastic portion can be elastically deformed along the axial direction and the circumferential direction. Selectable.
In the present invention, the stress applied to the tool gripper during machining can be absorbed with a simple configuration.
In a different form of the invention, at least one first gap and at least one second gap are continuous.
In this embodiment, the main body portion inner peripheral surface (the main body portion inner peripheral surface portion corresponding to the first elastic portion) and the main body portion outer peripheral surface (main body portion outer peripheral surface portion corresponding to the first elastic portion) pass through the first. The first gap and the second gap can be easily formed. In particular, when forming the voids using a wire cut processing method, a plurality of voids can be easily formed in a short time.
In a different form of the present invention, the plurality of first gaps and the plurality of second gaps are divided into a plurality of gap groups including the first gap and the second gap. The number of first voids and the number of second voids included in the void group are preferably set to be equal, but may be different. The gap group is arranged so that at least a part thereof overlaps at least one other gap group in the circumferential direction and the axial direction. The plurality of gap groups are preferably arranged along the circumferential direction.
In this embodiment, the first elastic part can be formed more easily.
In a different form of the present invention, the plurality of gap groups include the same number of first gaps and second gaps, but the first gap groups have different arrangement shapes of the first gaps and the second gaps. And a second void group. The first gap group and the second gap group are alternately arranged along the circumferential direction.
The first void and the second void included in the first void group and the first void and the second void included in the second void group are preferably formed continuously.
The arrangement shape of the first gap and the second gap included in the first gap group, and the arrangement shape of the first gap and the second gap included in the second gap group are preferably, It is set to be point symmetric.
In this embodiment, the first elastic part can be formed more easily.
In another embodiment of the present invention, a first cylindrical member that is movable along the axial direction in conjunction with elastic deformation along the axial direction of the first elastic portion is disposed on the outer peripheral side of the main body portion. Yes. For example, a first cylindrical member that is movable along the axial direction is arranged on the outer peripheral side of the first elastic portion, and is formed on the first cylindrical member at a position closer to the distal end side than the first elastic portion. A pin is disposed between the formed hole and the hole formed in the main body.
Moreover, it has the 2nd elastic part which can be elastically deformed in response to the movement along the axial direction of a 1st cylindrical member in the rear-end side of a 1st cylindrical member. For example, a step surface is formed on the outer peripheral surface of the main body portion on the rear end side from the first elastic portion, and the second surface is formed between the step surface of the outer peripheral surface of the main body portion and the end surface on the rear end side of the first cylindrical member. The elastic part is provided. For example, an O-ring can be used as the second elastic portion.
In this embodiment, due to the elastic characteristic of the second elastic part, the elastic characteristic when the first elastic part elastically deforms toward the rear end side along the axial direction (the elastic characteristic of contraction) is It can be set stronger than the elastic characteristic (elastic characteristic of elongation) when elastically deforming toward the tip side along the axial direction. Thereby, for example, the stress due to the difference (feed error) between the tap pitch and the machine feed can be absorbed by the elastic property of weak elongation. In addition, if the elastic characteristic of elongation is strong, there is a possibility that a screw wrinkle may occur when absorbing a feeding error. On the other hand, the stress generated when the blade edge of the tap bites the work can be absorbed by the elastic characteristics of strong shrinkage. If the elastic property of shrinkage is weak, the processing depth may become shallow when the blade edge of the tap bites the workpiece.
In another aspect of the present invention, the second cylindrical member that is movable along the axial direction in conjunction with the movement along the axial direction of the tool (the rear end portion of the tool) gripped by the tool gripping portion, It arrange | positions at the inner peripheral side of the main-body part. For example, a second cylindrical member that can be moved along the axial direction is screwed with a position adjusting member that can be brought into contact with the end face of the tool held by the tool holding portion, and the inner periphery of the main body portion. Place on the side.
Moreover, it has the 3rd elastic part which can be elastically deformed in connection with the movement along the axial direction of a 2nd cylindrical member in the rear-end side of a 2nd cylindrical member. For example, a step surface is formed on the inner peripheral surface of the main body portion on the rear end side from the first elastic portion, and a third surface is formed between the step surface on the inner peripheral surface of the main body portion and the end surface on the rear end side of the second cylindrical member. The elastic part is provided. For example, an O-ring can be used as the third elastic portion.
In this embodiment, due to the elastic characteristic of the third elastic part, the elastic characteristic when the first elastic part elastically deforms to the rear end side along the axial direction (elastic characteristic of shrinkage), It can be set stronger than the elastic characteristic (elastic characteristic of elongation) when elastically deforming toward the tip side along the axial direction. Thereby, for example, the stress due to the difference (feed error) between the tap pitch and the machine feed can be absorbed by the elastic property of weak elongation. On the other hand, the stress generated when the blade edge of the tap bites the work can be absorbed by the elastic characteristics of strong shrinkage.

  In the tool holder of this invention, the stress added to a tool at the time of a process can be absorbed with a simple structure.

It is sectional drawing of 1st Embodiment of the tool holder of this invention. It is the figure which expanded the part shown by the arrow II of FIG. FIG. 3 is a view showing an elastic part of the tool holder according to the first embodiment. It is the figure seen from the arrow IV direction of FIG. It is a figure which shows the elastic part of the tool holder of 2nd Embodiment. It is a figure which shows the elastic part of the tool holder of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
In this specification, the extending direction (direction A shown in FIG. 1) of the rotation center line P of the main body of the tool holder is referred to as “axial direction”. Also, in a cross section perpendicular to the axial direction, the direction along the arc centering on the rotation center (rotation center line P) of the main body is called “rotation direction” or “circumferential direction”, and the rotation center of the main body is The direction of the passing line is called “radial direction”. Further, along the axial direction, the side where the tool is inserted (right side in FIG. 1) is referred to as “front end side”, and the side opposite to the side where the tool is inserted (left side in FIG. 1) is referred to as “rear end side”. .

  A first embodiment 100 of the tool holder of the present invention will be described with reference to FIGS. 1 and 2. The tool holder 100 of 1st Embodiment is comprised as a tap holder holding the tap which performs the tap process which forms a female screw hole in a workpiece | work. 1 is a cross-sectional view of the tool holder 100 of the first embodiment, and FIG. 2 is an enlarged view of a portion indicated by an arrow II in FIG.

The tool holder 100 of this embodiment includes a main body 200. In the present embodiment, the main body 200 is made of steel.
The main body 200 is formed in a cylindrical shape having a main body inner peripheral surface 240 and a main body outer peripheral surface 250.
The main body inner peripheral surface 240 has first to fifth main body inner peripheral surface portions 241 to 245. The third main body portion inner peripheral surface portion 243 is formed as a stepped surface connecting the second main body portion inner peripheral surface portion 242 and the fourth main body portion inner peripheral surface portion 244 having different inner diameters.
The main body outer peripheral surface 250 has first to sixth main body outer peripheral surface portions 251 to 256. The third main body portion outer peripheral surface portion 253 is formed as a stepped surface connecting the second main body portion outer peripheral surface portion 252 and the fourth main body portion outer peripheral surface portion 254 having different outer diameters, and the fifth main body portion. The outer peripheral surface portion 255 is formed as a stepped surface connecting the fourth main body portion outer peripheral surface portion 254 and the sixth main body portion outer peripheral surface portion 256 having different outer diameters.
Further, a main body inner space 260 is formed by the main body inner peripheral surface 240. A cooling medium (for example, cooling oil) that cools the tool 10 gripped by the tool gripping portion 220 flows in the main body inner space 260. The main body inner space 260 has first to third main body inner space portions 261 to 263. The third body portion inner space portion 263 forms a tool insertion space into which the held portion 11 of the tap 10 is inserted.

The main body 200 has a shank portion 210 on the rear end side, a tool gripping portion 220 on the tip end side, and an elastic portion 230 between the shank portion 210 and the tool gripping portion 220.
In addition, a tool gripping mechanism 300 that holds the tool 10 (hereinafter referred to as “tap 10”) in cooperation with the tool gripping unit 220 of the main body 200 is provided.
In addition, the stress that includes the elastic portion 230 of the main body 200 and is applied to the cutting edge of the tap 10 during tapping, that is, the stress that is applied to the tool gripping portion 220 that holds the tap 10 (axial stress and rotational stress). The stress absorption mechanism 400 is absorbed.
The elastic part 230 corresponds to the “first elastic part” of the present invention.

  The first main body portion outer peripheral surface portion 251 corresponding to the shank portion 210 is formed in a tapered shape. By gripping the first main body portion outer peripheral surface portion 251 by the gripping mechanism provided in the machine tool, the shank portion 210 is gripped by the gripping mechanism and coupled to the spindle of the machine tool. As the gripping mechanism for gripping the shank portion 210, various known gripping mechanisms are used.

The tool gripping unit 220 grips the tap 10 in cooperation with the tool gripping mechanism 300.
A spiral blade is formed at a predetermined pitch on the tip side of the tap 10. A held portion 11 having a held surface 12 on the outer peripheral side is provided on the rear end side of the tap 10.
The tool gripping mechanism 300 includes a collet 310, an engagement member 320, and a fastening tool 330.
The collet 310 is inserted into the third main body portion inner space portion 263 formed by the fifth main body portion inner peripheral surface portion 245 corresponding to the tool gripping portion 220. Tapered surfaces that can be engaged with each other are formed on the front end side of the fifth main body portion inner peripheral surface portion 245 corresponding to the tool gripping portion 220 and the rear end side of the collet outer peripheral surface 312 of the collet 310. The engagement member 320 is disposed on the outer periphery on the tip side of the collet 310. Further, the front end side of the fastening tool 330 is disposed on the outer periphery of the engaging member 320, and the rear end side is screwed to the sixth main body part outer peripheral surface portion 256 corresponding to the tool gripping part 220. Further, the held portion 11 of the tap 10 is inserted through a hole formed in the collet 310.
When the fastening tool 330 is rotated in this state, the fastening tool 330, the engaging member 320, and the collet 310 move in the front-rear direction (axial direction). When the collet 310 moves to the rear end side, the engagement between the tapered surface formed on the inner peripheral surface portion 245 of the fifth main body portion corresponding to the tool gripping portion 220 and the tapered surface formed on the collet outer peripheral surface 312 of the collet 310 As a result, the held surface 12 of the held portion 11 of the tap 10 is held, and the tap 10 is held by the tool holding portion 220. On the other hand, when the collet 310 moves to the tip side, the grip of the tap 10 is released.

The elastic portion 230 is configured to be elastically deformable along the circumferential direction and the axial direction, and absorbs circumferential stress and axial stress applied to the blade edge of the tap 10 when tapping is performed using the tap 10. To do.
The elastic part 230 of this embodiment is demonstrated with reference to FIG. 3, FIG. 3 is a view of the elastic portion 230 as seen from the outer peripheral side, and FIG. 4 is a view as seen from the direction of arrow IV in FIG.

The elastic part 230 has a plurality of gaps penetrating between the fourth main body part inner peripheral surface part 244 and the fourth main body part outer peripheral surface part 254 corresponding to the elastic part 230.
In the present embodiment, the plurality of gaps formed in the elastic portion 230 includes a plurality of first gaps extending along the circumferential direction and a plurality of second gaps extending along the axial direction. . The “first gap extending along the circumferential direction” includes a gap extending substantially along the circumferential direction, and the “second gap extending along the axial direction” includes A void extending along the generally axial direction is included.
The first gap extending along the circumferential direction is configured such that at least a portion thereof overlaps with at least one other first gap along the circumferential direction. In addition, the second gap extending along the axial direction is configured so that at least a part thereof overlaps with at least one other second gap along the axial direction.

The plurality of first gaps and the plurality of second gaps are divided into a plurality of gap groups including the first gap and the second gap.
In the present embodiment, the first gap group 231 including the first gaps 232a to 232c extending along the circumferential direction and the second gaps 233a to 233d extending along the axial direction, and the circumferential direction. Are divided into a second air gap group 234 including first air gaps 235a to 235c extending in the axial direction and second air gaps 236a to 236d extending in the axial direction. Further, in the present embodiment, the space is divided into two first gap groups 231 and two second gap groups 234.

It penetrates between the main body inner peripheral surface 240 (fourth main body inner peripheral surface portion 244 corresponding to the elastic portion 230) and the main body outer peripheral surface 250 (fourth main body outer peripheral surface portion 254 corresponding to the elastic portion 230). The void to be formed may be formed using a wire cut processing method. When forming a space | gap using a wire cut processing method, it is necessary to form a start hole. That is, in order to individually form a plurality of gaps using the wire cutting method, it is necessary to form a start hole for each gap.
When forming the first gap and the second gap using the wire cut processing method, at least one first gap and at least one of the first gap and the second gap are provided so that the machining operation can be easily performed in a short time. It is preferable that one second gap is continuous.

In the present embodiment, the first gaps 232a to 232c and the second gaps 233a to 233d included in the first gap group 231 are configured to be continuous.
Specifically, the second gap 233a extends from the end of the first gap 232a extending along the circumferential direction on one side in the circumferential direction (upper side in FIG. 3) to the tip side along the axial direction. The second gap 233b extends from the end of the first gap 232a on the other circumferential side (the lower side in FIG. 3) to the tip side along the axial direction. The first gap 232b extends from the end of the second gap 233a to the other circumferential side along the circumferential direction, and the end of the first gap 232b on the other circumferential side. The second gap 233c extends on the rear end side along the axial direction. In addition, the first gap 232c extends from the end of the second gap 233b on the one side in the circumferential direction along the circumferential direction, and the end of the first gap 232c on the one side in the circumferential direction. Thus, the second gap 233d extends on the rear end side along the axial direction. The second gap 233c has a curved shape (for example, an arc shape) protruding to the other side in the circumferential direction, and the second gap 233d is a curved shape (for example, an arc shape) protruding to the one side in the circumferential direction. Shape).

Similarly, the first gaps 235a to 235c and the second gaps 236a to 236d included in the second gap group 234 are configured to be continuous.
Specifically, the second gap 236a extends from the end on one side in the circumferential direction (upper side in FIG. 4) of the first gap 235a extending along the circumferential direction to the rear end side along the axial direction. A second gap 236b extends from the end of the first gap 235a on the other circumferential side (lower side in FIG. 4) to the rear end side along the axial direction. And the 1st space | gap 235b is extended in the circumferential direction other side along the circumferential direction from the edge part of the rear-end side of the 2nd space | gap 236a, and the edge of the circumferential direction other side of the 1st space | gap 235b A second gap 236c extends from the portion to the tip side along the axial direction. In addition, the first gap 235c extends from the end of the second gap 236b to the one side in the circumferential direction along the circumferential direction, and the end of the first gap 235c on the one side in the circumferential direction. Thus, a second gap 236d extends on the tip side along the axial direction. The second gap 236c has a curved shape (for example, an arc shape) protruding to the other side in the circumferential direction, and the second gap 236d is a curved shape (for example, protruding to one side in the circumferential direction) Arc shape).

  In the present embodiment, the first gaps 232a to 232c and the second gaps 233a to 233d included in the first gap group 231 are arranged in the circumferential direction and included in the second gap group 234. The first gaps 235a to 235c and the second gaps 236a to 236d are arranged so that the arrangement shapes along the circumferential direction are point-symmetric. That is, the arrangement shape of the voids included in the first void group 231 and the arrangement shape of the voids included in the second void group 234 are set to coincide with the other when one is rotated 180 degrees.

The gap group (the first gap group 231 and the second gap group 234) is configured so that at least a part thereof overlaps at least one other gap group along the circumferential direction and the axial direction.
In the present embodiment, the first gap group 231 and the second gap group 234 are alternately arranged along the circumferential direction, and the first gap group 231 and the second gap group adjacent to each other in the circumferential direction. 234 is arranged so as to partially overlap in the circumferential direction and the axial direction.
Specifically, the second gap 233c included in the first gap group 231 is disposed between the second gaps 236b and 236d included in the second gap group 234 adjacent to one side in the circumferential direction, The second gap 236c included in the first gap group 231 is configured to be disposed between the second gaps 236a and 236c included in the second gap group 234 adjacent to the other circumferential side. Yes. Alternatively, the second gap 236c included in the second gap group 234 is disposed between the second gaps 233b and 233d included in the first gap group 231 adjacent to the other circumferential side, and the second gap The second gap 236d included in the gap group 234 is configured to be disposed between the second gaps 233a and 233c included in the first gap group 231 adjacent to one side in the circumferential direction.

When tapping is performed to form a female screw hole in the workpiece by the tap 10, if axial stress or rotational stress is applied to the tap 10, axial stress or rotational stress is also applied to the tool gripping portion 220. Stress is applied. This stress is also applied to the elastic part 230 connected to the tool gripping part 220. For example, stress in the direction from the front end side to the rear end side along the axial direction, or stress in the direction opposite to the rotation direction of the tap 10 is applied along the rotation direction.
In the present embodiment, the elastic part 230 is configured to be elastically deformable along the axial direction and the circumferential direction.
For this reason, for example, when stress in the A2 direction is applied to the elastic portion 230 along the axial direction, the elastic portion 230 is elastically deformed (shrinks) in the A2 direction along the axial direction, so that the A2 direction along the axial direction. The stress of is absorbed. When the stress in the A2 direction decreases along the axial direction, the elastic portion 230 that has been elastically deformed returns to its original shape (extends).
Further, when a stress along the circumferential direction is applied to the elastic portion 230 via the tool gripping portion 220, the elastic portion 230 is elastically deformed along the circumferential direction, so that the stress along the circumferential direction is absorbed. When the stress along the circumferential direction decreases, the elastic portion 230 that has been elastically deformed returns to its original shape.
When the stress in the A2 direction and the stress in the circumferential direction are applied to the elastic portion 230 along the axial direction, the elastic portion 230 is elastically deformed in the A2 direction along the axial direction and elastically deformed along the circumferential direction. By (elastically deforming in a twisted shape), the stress in the A2 direction and the stress in the circumferential direction are absorbed along the axial direction. When the stress in the A2 direction and the stress in the circumferential direction decrease along the axial direction, the elastic portion 230 that has been elastically deformed returns to its original shape.

During tapping, stress due to the difference between the tap pitch and the machine feed (called “feed error”) or stress due to the tap edge biting against the workpiece is applied to the tap. The stress due to the feeding error can be absorbed by the elastic deformation of the extension of the elastic portion 230, and the stress due to the tap blade biting against the work can be absorbed by the elastic deformation of the contraction of the elastic portion 230.
Here, when the stress due to the feeding error is absorbed by the elastic characteristic of the elongation of the elastic part 230, if the elastic characteristic of the elastic part 230 is strong, there is a possibility that a screw will be formed. It is preferable to set the characteristics weakly. On the other hand, when absorbing the stress due to the tap blade biting into the workpiece by the elastic characteristic of the elastic part 230 contraction, if the elastic characteristic of the elastic part 230 contraction is weak, the processing depth may be shallow, It is preferable to set the elastic characteristic of the contraction of the elastic part 230 strongly.
The elastic part 230 alone cannot set the elastic characteristic of strong shrinkage and the elastic characteristic of weak elongation.
Therefore, in this embodiment, while using the elastic portion 230 that can absorb the stress in the axial direction and the circumferential direction with a simple structure, the elastic characteristics of the stretch and the tap edge that are appropriate for absorbing the stress due to the feeding error are obtained. A stress absorbing mechanism 400 capable of setting an appropriate shrinkage elastic characteristic for absorbing stress caused by biting on the workpiece is provided.

The stress absorbing mechanism 400 of this embodiment includes an elastic part 230, a collar 410 for adjusting the elastic characteristics of the elastic part 230, a support member 420, a position adjustment member 430, and O-rings 461 and 462.
Note that the fourth main body inner peripheral surface portion 244 and the fourth main body outer peripheral surface portion 254 corresponding to the elastic portion 230 and the sixth main body outer peripheral surface portion 256 corresponding to the tool gripping portion 220 are perpendicular to the axial direction. When viewed in a simple cross section, it has a circular shape with the center of rotation as the center point.
Further, the main body 200 has a hole 272 formed by a hole wall surface 271 on the front end side from the elastic portion 230 and opened on the fourth main body outer peripheral surface portion 254 side, and on the rear end side from the elastic portion 230. And a communication hole 274 formed by the hole wall surface 273.

The collar 410 is formed in a cylindrical shape having a collar inner peripheral surface 411 and a collar outer peripheral surface 412. The collar inner peripheral surface 411 and the collar outer peripheral surface 412 have a circular shape with the center of rotation as the center point when viewed in a cross section perpendicular to the axial direction. The collar 410 has a communication hole 416 formed by the hole wall surface 415 on the front end side and a communication hole 418 formed by the hole wall surface 417 on the rear end side.
The collar 410 is disposed on the outer peripheral side of the fourth main body outer peripheral surface portion 254. Then, the pin 441 is inserted into the communication hole 416 of the collar 410 and the hole 272 of the main body 200. As a result, the collar 410 is connected to the main body 200 by the pin 441 at a position closer to the tip than the elastic portion 230. That is, when the elastic portion 230 is elastically deformed along the axial direction (in conjunction with the elastic deformation along the axial direction of the elastic portion 230), the collar 410 moves along the fourth main body portion outer peripheral surface portion 254 (in the axial direction). Move along the direction).
When the inner diameter of the communication hole 416 is set to be larger than the outer diameter of the pin 441, the timing at which the collar 410 moves along the axial direction in conjunction with the elastic deformation along the axial direction of the elastic portion 230 is determined. The delay can be made according to the difference between the inner diameter and the outer diameter of the pin 441. Of course, the collar 410 can be configured to move immediately along the axial direction in conjunction with the elastic deformation along the axial direction of the elastic portion 230.
In addition, an O-ring 461 is disposed between the third outer peripheral surface portion (step surface) 253 and the end surface 413 on the rear end side of the collar 410. The O-ring 461 is formed of rubber or the like so as to be elastically deformable at least along the axial direction.
A cover 450 is disposed on the outer peripheral side of the collar 410. The cover 450 is formed in a bottomed cylindrical shape having a cylindrical portion 451 and a bottom portion 452. A hole is formed by a hole wall surface 453 at the center of the bottom 452. The cover 450 is attached to the main body 200 by screwing screws formed in the hole wall surface 453 and the sixth main body outer peripheral surface portion 256.
The collar 410 corresponds to the “first cylindrical member” of the present invention. The O-ring 461 corresponds to the “second elastic portion” of the present invention.

The support member 420 is formed in a cylindrical shape having a support member inner peripheral surface 421 and a support member outer peripheral surface 422. The support member inner peripheral surface 421 and the support member outer peripheral surface 422 have a circular shape centered on the center of rotation when viewed in a cross section perpendicular to the axial direction. Further, the support member 420 has a hole 426 formed on the rear end side by a hole wall surface 425 and opened on the support member outer peripheral surface 422 side.
The support member 420 is disposed on the inner peripheral side of the fourth main body portion inner peripheral surface portion 244 (third main body portion inner space portion 263 formed by the fourth main body portion inner peripheral surface portion 244). Then, the pins 442 are inserted into the communication holes 418 of the collar 410, the communication holes 274 of the main body 200, and the holes 426 of the support member 420. Here, the inner diameter of the hole 426 of the support member 420 is set larger than the outer diameter of the pin 442. As a result, the support member 420 can move relative to the pin 442 within the range of the difference between the inner diameter of the hole 426 and the outer diameter of the pin 442. When the hole wall surface 425 forming the hole 426 contacts the pin 442, the movement of the support member 420 (movement along the axial direction, movement along the circumferential direction) is blocked.
The communication hole 418 of the collar 410 is set so that the movement of the collar 410 along the axial direction is not hindered by the contact between the hole wall surface 417 forming the communication hole 418 and the outer peripheral surface of the pin 442.
In addition, an O-ring 462 is disposed between the inner peripheral surface portion (step surface) 243 of the third main body portion and the end surface 423 on the rear end side of the support member 420. The O-ring 462 is formed of rubber or the like so as to be elastically deformable at least along the axial direction.
Further, an O-ring 463 is disposed between the fourth main body portion outer peripheral surface portion 244 and the support member outer peripheral surface 422.
The O-ring 462 is also disposed between the fourth main body portion outer peripheral surface portion 244 and the support member outer peripheral surface 422. The O-rings 462 and 463 prevent the cooling medium flowing in the main body inner space 260 from flowing out of the air gap formed in the elastic part 230 and the communication hole formed in the collar 410.

The position adjusting member 430 is formed in a cylindrical shape having a position adjusting member inner peripheral surface 431 and a position adjusting member outer peripheral surface 432. The position adjusting member inner circumferential surface 431 forms a position adjusting member inner space through which the cooling medium flows.
The position adjustment member 430 is mounted on the inner peripheral side of the support member inner peripheral surface 421 by screwing screws formed on the support member inner peripheral surface 421 and the position adjustment member outer peripheral surface 432. By rotating the position adjusting member 430 to adjust the screwing position, the position of the position adjusting member 430 along the axial direction with respect to the support member 420 can be adjusted. By adjusting the position of the position adjustment member 430 along the axial direction with respect to the support member 420, the end surface 13 on the rear end side of the tap 10 held by the tool holding portion 220 and the end surface 434 on the front end side of the position adjustment member 430. The position (protrusion length) along the axial direction of the tap 10 can be adjusted.
Accordingly, when the end surface 434 on the front end side of the position adjusting member 430 and the end surface 13 on the rear end side of the tap 10 are in contact with each other, the tap 10 moves along the axial direction by the stress applied to the tap 10 (tap 10 The position adjustment member 430 and the support member 420 move along the axial direction in conjunction with the movement of the end surface 13 on the rear end side along the axial direction.
In addition, when it is set so that the end surface 434 on the front end side of the position adjusting member 430 and the end surface 13 on the rear end side of the tap 10 do not come into contact with each other, even if the tap 10 moves in the axial direction, The adjustment member 430 and the support member 420 do not move along the axial direction. That is, the adjustment function of the elastic characteristic of the elastic portion 230 contracted by the O-ring 462, which will be described later, is released.
The position adjustment member 430 corresponds to the “position adjustment member capable of adjusting the position along the axial direction of the tool” of the present invention. The support member 420 corresponds to the “second cylindrical member” of the present invention. The O-ring 462 corresponds to the “third elastic portion” of the present invention.

Next, operation | movement of the tool holder 100 of this embodiment is demonstrated. In the following, the end surface 434 on the front end side of the position adjustment member 430 is in contact with the end surface 13 on the rear end side of the tap 10 (the position along the axial direction of the tap 10 is adjusted by the position adjustment member 430). Will be described.
The tap 10 is rotated while the held portion 11 of the tap 10 is gripped by the tool gripping portion 220.
When tapping is performed to form a female screw hole in the workpiece by the tap 10, if axial stress or rotational stress is applied to the tap 10, axial stress or rotational stress is also applied to the tool gripping portion 220. Stress is applied. This stress is also applied to the elastic part 230 of the stress absorbing mechanism 400 coupled to the tool gripping part 220. Thereby, the elastic part 230 is elastically deformed in the axial direction or the circumferential direction.
Here, when the elastic part 230 is elastically deformed along the axial direction toward the rear end side (contraction direction), the pin 441 causes the main body part 200 to be immediately or slightly delayed in conjunction with the elastic deformation in the contraction direction. The connected collar 410 moves to the rear end side along the axial direction.
When the collar 410 moves to the rear end side along the axial direction, the O-ring 461 disposed on the rear end side of the collar 410 is elastically deformed toward the rear end side along the axial direction.
When the O-ring 461 is elastically deformed toward the rear end side along the axial direction, the movement of the collar 410 toward the rear end side along the axial direction is suppressed, and further, the elastic portion 230 extends along the axial direction. Further, elastic deformation toward the rear end side (the shrinking direction) is suppressed. That is, the elastic characteristic of the elastic part 230 is set substantially stronger by the elastic characteristic of the O-ring 461.
On the other hand, when the elastic portion 230 is elastically deformed toward the distal end side along the axial direction, there is almost no influence by the elastic deformation of the O-ring 461. That is, the elastic characteristic of the elongation of the elastic part 230 remains the same.

Further, when the elastic member 230 is elastically deformed toward the rear end side along the axial direction, the tap 10 (the end surface 13 on the rear end side of the tap 10) moves toward the rear end side along the axial direction (tool axis). In conjunction with the movement along the direction), the position adjustment member 430 and the support member 420 screwed to the position adjustment member 430 also move to the rear end side along the axial direction.
When the support member 420 moves toward the rear end side along the axial direction, the O-ring 462 elastically deforms toward the rear end side along the axial direction.
When the O-ring 462 is elastically deformed toward the rear end side along the axial direction, the movement of the support member 420 and the position adjusting member collar 410 toward the rear end side along the axial direction is suppressed, and further, the elastic portion The elastic deformation of 230 toward the rear end side (contraction direction) along the axial direction is suppressed. In other words, the elastic characteristic of the contraction of the elastic part 230 is substantially set by the elastic characteristic of the O-ring 462.
On the other hand, when the elastic portion 230 is elastically deformed toward the distal end side along the axial direction, there is almost no influence by the elastic deformation of the O-ring 462. That is, the elastic characteristic of the elongation of the elastic part 230 remains the same.
When the end surface 434 on the front end side of the position adjusting member 430 is not in contact with the end surface 13 on the rear end side of the tap 10, the adjustment function of the elastic characteristics of the elastic portion 230 by the O-ring 462 does not work.

Next, the elastic part 230 of the tool holder of 2nd Embodiment is demonstrated with reference to FIG.
The elastic part 230 of the present embodiment includes a first gap group 231 including first gaps 232a to 232e extending along the circumferential direction and second gaps 233a to 233d extending along the axial direction, It is divided into a second gap group 234 including first gaps 235a to 235e extending along the circumferential direction and second gaps 236a to 236d extending along the axial direction. Further, as in the first embodiment, the first gap group 231 and the second second gap group 234 are divided.
In addition, the first gaps 232a to 232e and the second gaps 233a to 233d included in the first gap group 231 are configured to be continuous.
Specifically, the second gap 233a extends from the end of the first gap 232a extending along the circumferential direction on one side in the circumferential direction (the upper side in FIG. 5) toward the tip side along the axial direction. The second gap 233b extends from the end of the first gap 232a on the other circumferential side (the lower side in FIG. 5) to the tip side along the axial direction. The first gap 232b extends from the end of the second gap 233a to the other circumferential side along the circumferential direction, and the end of the first gap 232b on the other circumferential side. The second gap 233c extends on the rear end side along the axial direction, and the first gap on the one side in the circumferential direction along the circumferential direction from the end on the rear end side of the second gap 233c. 232d extends. In addition, the first gap 232c extends from the end of the second gap 233b on the one side in the circumferential direction along the circumferential direction, and the end of the first gap 232c on the one side in the circumferential direction. The second gap 233d extends on the rear end side along the axial direction, and the first gap on the other circumferential side along the circumferential direction from the rear end side end of the second gap 233d. 232e extends.
Similarly, the first gaps 235a to 235e and the second gaps 236a to 236d included in the second gap group 234 are configured to be continuous.
Specifically, the second gap 236a extends from the end on one side in the circumferential direction of the first gap 235a extending along the circumferential direction to the rear end side along the axial direction. The second gap 236b extends from the end on the other circumferential side of the gap 235a to the rear end side along the axial direction. And the 1st space | gap 235b is extended in the circumferential direction other side along the circumferential direction from the edge part of the rear-end side of the 2nd space | gap 236a, and the edge of the circumferential direction other side of the 1st space | gap 235b The second gap 236c extends on the tip side along the axial direction from the portion, and the first gap 235d on the one side in the circumferential direction along the circumferential direction from the end portion on the tip side of the second gap 236c. Is extended. In addition, the first gap 235c extends from the end of the second gap 236b after the rear end to one side in the circumferential direction along the circumferential direction, and the end of the first gap 235c on the one side in the circumferential direction. The second gap 236d extends on the distal end side along the axial direction from the portion, and the first gap 235e on the other circumferential side along the circumferential direction from the distal end end of the second gap 236d. Is extended.
In the present embodiment, the first gaps 232a to 232e, 235a to 235e and the second gaps 233a to 233d and 236a to 236d have a linear shape.
Arc shape).

In addition, the arrangement shape of the first gaps 232a to 232e and the second gaps 233a to 233d included in the first gap group 231 along the circumferential direction, and the first gap included in the second gap group 234 235a-235e and 2nd space | gap 236a-236d are comprised so that the arrangement | positioning shape along the circumferential direction may become the same.
In addition, the first gap group 231 and the second gap group 234 include the first gap and the second gap in the first gap group 231 and the first gap and the second gap in the second gap group 234. The arrangement shape of the two gaps is configured to be point symmetric.
Further, the gap group is configured so that at least a part thereof overlaps at least one other gap group along the circumferential direction and the axial direction.
In the present embodiment, the first gap group 231 and the second gap group 234 are alternately arranged along the circumferential direction, and the first gap group 231 and the second gap group adjacent to each other in the circumferential direction. 234 is arranged so as to partially overlap in the circumferential direction and the axial direction.
Specifically, the first gap 232d included in the first gap group 231 is disposed between the first gaps 235c and 235e included in the second gap group 234 adjacent to one side in the circumferential direction, The first gap 232e included in the first gap group 231 is configured to be disposed between the first gaps 235b and 235d included in the second gap group 234 adjacent to the other circumferential side. Yes. Alternatively, the first gap 235d included in the second gap group 234 is disposed between the first gaps 232c and 232e included in the first gap group 231 adjacent to the other circumferential side, and the second gap The first gap 235e included in the gap group 234 is configured to be disposed between the first gaps 232b and 232d included in the first gap group 231 adjacent to one side in the circumferential direction.

Next, the elastic part 230 of the tool holder of 3rd Embodiment is demonstrated with reference to FIG.
The elastic part 230 of the present embodiment includes a first gap group 231 including first gaps 232a to 232c extending along the circumferential direction and second gaps 233a to 233d extending along the axial direction, It is divided into a second gap group 234 including first gaps 235a to 235c extending along the circumferential direction and second gaps 236a to 236d extending along the axial direction. Further, as in the first embodiment, the first gap group 231 and the second second gap group 234 are divided.
In addition, the first gaps 232a to 232c and the second gaps 233a to 233d included in the first gap group 231 are configured to be continuous.
Specifically, the second gap 233a extends from the end on one side in the circumferential direction (upper side in FIG. 6) of the first gap 232a extending along the circumferential direction to the tip side along the axial direction. The second gap 233b extends from the end of the first gap 232a on the other circumferential side (the lower side in FIG. 6) to the tip side along the axial direction. The first gap 232b extends from the end of the second gap 233a to the other circumferential side along the circumferential direction, and the end of the first gap 232b on the other circumferential side. The second gap 233c extends on the rear end side along the axial direction. In addition, the first gap 232c extends from the end of the second gap 233b on the one side in the circumferential direction along the circumferential direction, and the end of the first gap 232c on the one side in the circumferential direction. Thus, the second gap 233d extends on the rear end side along the axial direction.
Similarly, the first gaps 235a to 235c and the second gaps 236a to 236d included in the second gap group 234 are configured to be continuous.
Specifically, the second gap 236a extends from the end on one side in the circumferential direction of the first gap 235a extending along the circumferential direction to the rear end side along the axial direction. The second gap 236b extends from the end on the other circumferential side of the gap 235a to the rear end side along the axial direction. And the 1st space | gap 235b is extended in the circumferential direction other side along the circumferential direction from the edge part of the rear-end side of the 2nd space | gap 236a, and the edge of the circumferential direction other side of the 1st space | gap 235b A second gap 236c extends from the portion to the tip side along the axial direction. In addition, the first gap 235c extends from the end of the second gap 236b after the rear end to one side in the circumferential direction along the circumferential direction, and the end of the first gap 235c on the one side in the circumferential direction. A second gap 236d extends from the portion to the tip side along the axial direction.
In the present embodiment, the first gaps 232a to 232c, 235a to 235c and the second gaps 233a to 233d and 236a to 236d have a linear shape.

The arrangement shape of the first gaps 232a to 232c and the second gaps 233a to 233d included in the first gap group 231 and the first gaps 235a to 235c and the second gap included in the second gap group 234 are also described. The arrangement shapes of the gaps 236a to 236d are set to be point-symmetric.
Further, the gap group is configured so that at least a part thereof overlaps at least one other gap group along the circumferential direction and the axial direction.
In the present embodiment, the first gap group 231 and the second gap group 234 are alternately arranged along the circumferential direction, and the first gap group 231 and the second gap group adjacent to each other in the circumferential direction. 234 is arranged so as to partially overlap in the circumferential direction and the axial direction.
Specifically, the second gap 233c included in the first gap group 231 is disposed between the second gaps 236b and 236d included in the second gap group 234 adjacent to one side in the circumferential direction, The second gap 233d included in the first gap group 231 is configured to be disposed between the second gaps 236a and 236c included in the second gap group 234 adjacent to the other circumferential side. . Alternatively, the second gap 236c included in the second gap group 234 is disposed between the second gaps 233b and 233d included in the first gap group 231 adjacent to the other circumferential side, and the second gap The second gap 236d included in the gap group 234 is configured to be disposed between the second gaps 233a and 233c included in the first gap group 231 adjacent to one side in the circumferential direction.

As described above, in the first to third embodiments, the axial and circumferential stress applied to the tap at the time of tapping can be absorbed by the elastic portion 230 (first elastic portion) having a simple configuration.
Further, the O-ring 461 (second ring) that elastically deforms toward the rear end side along the axial direction in conjunction with the elastic deformation of the elastic portion 230 (first elastic portion) toward the rear end side along the axial direction. The elastic part) and the tool held by the tool gripping part (the end face on the rear end side of the tool) in conjunction with the movement toward the rear end side along the axial direction, toward the rear end side along the axial direction. The elastic characteristic of the elastic part 230 (first elastic part) toward the rear end side along the axial direction (elastic characteristic of shrinkage) can be adjusted by the O-ring 462 (third elastic part) that is elastically deformed. it can. That is, the elastic characteristic of the elastic part 230 (first elastic part) and the elastic characteristic of the elongation can be appropriately set. Thereby, stress due to feed error and stress due to biting of the tap blade edge can be effectively absorbed without lowering the machining accuracy.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
The first gap extending along the circumferential direction includes the gap extending along the substantially circumferential direction, and the second gap extending along the axial direction extends along the substantially axial direction. Including voids.
Although the 1st space | gap extended along the circumferential direction and the 2nd space | gap extended along an axial direction continued the space | gap formed in the 1st elastic part (elastic part 230), The second gap can also be formed individually.
Dividing the plurality of first gaps extending along the circumferential direction and the plurality of second gaps extending along the axial direction into a plurality of gap groups including the first gap and the second gap, Although arranged in the first elastic part (elastic part 230) in group units, it can also be arranged in the first elastic part in units of first and second gaps.
The number, shape, arrangement position, and the like of the first gap extending along the circumferential direction and the second gap extending along the axial direction are such that the first elastic portion (elastic portion 230) is circumferential and axial. It can be appropriately changed within a range that can be elastically deformed along the direction.
The gap formed in the first elastic portion (elastic portion 230) is not limited to the first gap extending along the circumferential direction and the second gap extending along the axial direction. The elastic portion can be appropriately changed within a range in which the elastic portion can be elastically deformed along the circumferential direction and the axial direction. For example, a gap extending in a crossing manner with respect to the axial direction and the circumferential direction along the outer peripheral surface of the main body can be formed in the first elastic portion.
An O-ring is used as a second elastic portion provided on the rear end side of the first cylindrical member (collar 410) and elastically deformable in conjunction with the movement of the first cylindrical member along the axial direction. However, various elastic members other than the O-ring can be used as the second elastic portion.
An O-ring was used as a third elastic portion that is provided on the rear end side of the second cylindrical member (support member 420) and can be elastically deformed in conjunction with the movement of the rear end portion of the tool along the axial direction. However, various elastic members other than the O-ring can be used as the third elastic portion.
Although the first elastic part and the second elastic part are provided, either one or both of the first elastic part and the second elastic part can be omitted.
The tool holder of the present invention is preferably used when holding a tap for forming a female screw hole in a workpiece, but can be used when holding various tools other than the tap.
Each structure demonstrated by embodiment can also be used independently, and can also be used combining the some structure selected suitably.

The present invention
“A tool holder having a main body portion having an inner peripheral surface and a main body outer peripheral surface, the main body portion having a shank portion on the rear end side and a tool gripping portion on the front end side. And
The main body has a first elastic part between the shank part and the tool gripping part,
The first elastic portion has a plurality of gaps penetrating between the inner peripheral surface of the main body portion and the outer peripheral surface of the main body portion, and is configured to be elastically deformable along the axial direction and the circumferential direction.
A first tubular member disposed on the outer peripheral side of the main body portion and movable along the axial direction in conjunction with elastic deformation along the axial direction of the first elastic portion;
A tool provided on the rear end side of the first cylindrical member, and having a second elastic portion that can be elastically deformed in conjunction with movement of the first cylindrical member along the axial direction. holder. (Aspect 1).
The present invention also provides:
“A tool holder according to aspect 1,
A second cylindrical member that is arranged on the inner peripheral side of the main body and is movable along the axial direction in conjunction with the movement along the axial direction of the rear end of the tool held by the tool holding portion; ,
A tool provided on the rear end side of the second cylindrical member, and having a third elastic portion that can be elastically deformed in conjunction with movement along the axial direction of the second cylindrical member. holder. ”(Aspect 2).
In the tool holder according to aspect 1 and aspect 2, the first elastic part is elastically deformed toward the rear end side along the axial direction by the elastic characteristic of the second elastic part or the elastic characteristic of the second and third elastic parts. The elastic characteristic (shrinking elastic characteristic) at the time can be set to be stronger than the elastic characteristic (elongation elastic characteristic) when the first elastic portion is elastically deformed toward the distal end side along the axial direction. Thereby, for example, the stress due to the difference between the tap pitch and the machine feed can be absorbed by the elastic characteristics of weak shrinkage, and screw distortion can be prevented. On the other hand, the stress generated when the tap edge bites against the work can be absorbed by the elastic property of strong elongation, and the tap working depth can be prevented from becoming shallow.

DESCRIPTION OF SYMBOLS 10 Tool 11 Held part 12 Held surface 13 Tool end surface 100 Tool holder 200 Main body part 210 Shank part 220 Tool holding part 230 Elastic part (1st elastic part)
231 First gap group 232a, 232b, 232c, 232d, 232e First gap 233a, 233b, 233c, 233d Second gap 234 Second gap group 235a, 235b, 235c, 235d, 235e First gap 236a 236b, 236c, 236d Second gap 240 Main body inner peripheral surfaces 241 to 245 First to fifth main body inner peripheral surface portions 250 Main body outer peripheral surfaces 251 to 256 First to sixth main body outer peripheral surface portions 260 Main body Inner space 261 to 263 First to third main body inner space 271 Hole wall surface 272 Hole 273 Hole wall surface 274 Communication hole 300 Tool gripping mechanism 310 Collet 320 Engaging member 330 Fastening tool 400 Stress absorbing mechanism 410 Collar 1 cylindrical member)
411 Collar inner peripheral surface 412 Collar outer peripheral surface 413 Color rear end surface 415, 417 Hole wall surface 416, 418 Communication hole 420 Support member (second cylindrical member)
421 Support member inner peripheral surface 422 Support member outer peripheral surface 423 Support member rear end surface 425 Hole wall surface 426 Hole 430 Position adjustment member 431 Position adjustment member inner peripheral surface 432 Position adjustment member outer peripheral surface 434 Position adjustment member front end surface 441, 442 Pin 450 Cover 451 Cylindrical part 452 Bottom part 453 Hole wall surface 461 O-ring (second elastic part)
462 O-ring (third elastic part)
463 O-ring

Claims (6)

A tool holder having a main body portion having an inner peripheral surface and a main body outer peripheral surface, the main body portion having a shank portion on a rear end side and a tool gripping portion on a front end side; ,
The main body has a first elastic part between the shank part and the tool gripping part,
The first elastic portion has a plurality of first gaps and a plurality of second gaps penetrating between the inner peripheral surface of the main body portion and the outer peripheral surface of the main body portion, along the axial direction and the circumferential direction. It is configured to be elastically deformable,
The first gap extends along the circumferential direction so that at least a portion of the first gap overlaps with at least one other first gap in the circumferential direction;
The tool holder according to claim 1, wherein at least a part of the second gap extends in the axial direction so as to overlap with at least one other second gap in the axial direction. The tool holder according to claim 1,
A tool holder, wherein at least one first gap and at least one second gap are continuous. The tool holder according to claim 1 or 2,
The plurality of first gaps and the plurality of second gaps are divided into a plurality of gap groups including a first gap and a second gap,
The tool holder is characterized in that at least a part of the gap group is arranged so as to overlap with at least one other gap group in a circumferential direction and an axial direction. A tool holder according to claim 3,
The plurality of gap groups include the same number of first gaps and second gaps, and the first gap group and the second gap group have different arrangement shapes of the first gap and the second gap. ,
The tool holder, wherein the first gap group and the second gap group are alternately arranged along a circumferential direction. The tool holder according to any one of claims 1 to 4,
A first tubular member disposed on the outer peripheral side of the main body portion and movable along the axial direction in conjunction with elastic deformation along the axial direction of the first elastic portion;
A tool provided on the rear end side of the first cylindrical member, and having a second elastic portion that can be elastically deformed in conjunction with movement of the first cylindrical member along the axial direction. holder. A tool holder according to any one of claims 1 to 5,
A second cylindrical member that is arranged on the inner peripheral side of the main body and is movable along the axial direction in conjunction with the movement along the axial direction of the rear end of the tool held by the tool holding portion; ,
A tool provided on the rear end side of the second cylindrical member, and having a third elastic portion that can be elastically deformed in conjunction with movement along the axial direction of the second cylindrical member. holder.

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